Hot-water heating apparatus.



H. A. BoLzF]` HOT WATER HEATING APPARATUS. APPLICATION FILED SEPT. 25, 1905.

Patented 0013.4, 1910.

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(Witwe/.som I HEINRICH ATHANASIUS BOLZE, 0F HANOVER, GERMANY.

HOT-WATER HEATING APPARATUS.

Specification of Letters Patent.

Patented ct. 4, 1910.

Application filed September 25, 1905. Serial No. 279,973.

To all whom it may concern:

Be it known that I, HEINRICH ATHANA- siUs BoLzE, a subject of ythe Emperor of Germany, residing in Hanover, in the German Empire, engineer, having invented certain new and useful Improvements in HotlVater Heating Apparatus, of which the following is a specification.

This invention relates to a hot water heating system having forced circulation, and has for its object the provision of means whereby the temperature of the several radiators of the system may be varied both collectively and independently. y

The salient feature' of the invention is the provision of a plurality of mains carrying water of diderent temperatures, one being highly heat-ed and the others to a much less degree. These supply mains are so connected to the intake of the respective radiators or radiator-groups that the radiator may be supplied with the hottest water or with a mixture, without affecting in any way the supply to otherradiators or radiator-groups. Furthermore, provision is made for connecting the mains or trunk supply pipes in such way as to supply a mixture of the water having an average temperature, to the whole system.

The invention as hereinafter more fully described and as particularly .set out in the claims, will be readily understood from an inspect" in of the accompanying drawing, in-

which- Figure 1 is a diagrammatic representation of one embodiment of the invention; and Fig. 2 is a similar view of a complete system posses: ing certain additional features.

As illustrated in Fig. 1 a is a heater inserted in the system.

b is a pump driven in any suit-able manner `and causing a forced circulation of the water.

c is a return main leading from the radiators to the pump Z whence the returning water is forced through pipe "d which branches into two pipes'e and f the pipe e leading through the heater a and serving as a hot water main, while the pipe f serves as al warm"` water main for .the radiators. A by-pass g leads from the hot water main e to the. warm water main vf and is provided with a valve h by means of which a portion of the hot water may be introduced to the warm water main suiicient to compensate for loss by radiation. As shown in Fig. 2,

this compensatory heat is-suppled to the main f by a second or auxiliary heater z' inserted therein, but in this case also the bypass g may be used, by the opening of the valve k, to transfer a portion of the highly heated water from the main e to the main f when it is desired toraise the temperature of the water supplied to the whole system.

The feed pipe la of the individual radiators or radiator-groups communicates with both the hot and warm water mains by connections having inserted therein a three-way cock m by which the radiators n may be supplied with water from the hot water main alone or from the warm Water main alone,

or from both. Instead of the three-way Under normal circumstances all the rap diators are fed by the warm water mam alone.

is opened and the temperature of the water inthe main f is -raised to an average higher point Jfor the 'whole system. .If a particular room' is exposed or a. higher temperature desired, the valves 7i and or the valve m, controlling the supply to at particular radiator or radiatorgroup,a.re so manipulated as to shut oi the supp y from the warm water main and take in water of a hi h tem rature from the hot yWater main a one. 'ewise, if a lpeaerticular radiator or radiatorlgmroup has eat the same again qulckly, it 1s also placed in communication wlth the hot water main alone until it is thoroughly heated, when the valves may be shifted to introduce water from the warm water main or a mixture of the two. It will thus be seen that by means of the bypass g the temperature of the water supplied from the mains e and f to the radiators in the, system is under theimmediate control of the engineer and may .be modified at will independent of the heater a, while by the valves p and q or m the oecupant of each room is enabled to control the temperature of the radiators therein without 110 In case of cold Weather the valve if, "i

n cut out and it is desired to interfering with the circulation of the Water through the radiators or affecting the other units of the system.

Having thus fully described my invention, what I claim as new and desire to secure by Letters-Patent is 1. In a circulating hot water heating system, the combination, with a hot water supply main, a warm water supply main, radiators, a return'main, and heating means inserted in the circuit, of valved connections between each ot' the supply' mains and the intake of the respective radiators, a direct connection from the outlet of each radiator to the return main, and a valved by-pass from the hot water main to the Warm Water main.

2. In a circulating hot water heating system, the combination, with a hot Water supply main, a warm Water supply main, radiators, a return main, and heating means inserted in the circuit, of a threeway Valve connect-ing the two supply mains t0 the intake of the respective radiator, a direct connection from the outlet of each radiator to the return main, and a valved by-pass from the hot water supply main to the 'ff-farm water supply main.

3. In a circulating hot water heating system, the combination, with a heater, a hot water supply main fed thereby, a Warm water supply main, radiators, a return main leading to the heater and also to the warm water supply main, a valved by-pass from the hot water supply main to the warm water supplv main, valved connections between each Uf the supply mains and the intake of the respective radiators, and a direct connection from the outlet of each radiator to the return main.

name to this specification in the presence of two subscribing wltnesses.

HEINRICH ATHANASIUS BOLZE.

Witnesses EMMA WHITE, ANNA DLPPEL.

In testimony whereof I have signed my 

